Purdue's Chris Kramer got the ultimate revenge against Michigan's Manny Harris.
Harris was ejected early in the second half on Saturday after hitting Kramer in the nose with an elbow and temporarily knocking him out.
The 16th-ranked Boilermakers (17-4, 6-2) then rallied behind their captain for a 67-49 victory in West Lafayette, Ind., outscoring Michigan 40-20 after the foul by the Wolverines' top scorer.
"We don't retaliate, we just get 'W's," Kramer said.
Kramer remained on the floor after the hit, and trainers tended to him for several minutes. Kramer said the team doctor believed his nose is broken.
"I was out, then I woke up and there was a pool of blood around me," he said.
As Kramer stood near halfcourt with a bloody towel over his face, he raised his right arm several times to fire up the crowd before leaving the court for treatment.
Michigan coach John Beilein told the referee he thought an ejection was unwarranted.
Kramer, wearing a protective mask, returned to thunderous applause with 14:53 left in the game.
Michigan (14-8, 4-6) played without guard Zack Novak, who was suspended for this game after being ejected for throwing a flagrant elbow in a loss to Ohio State.
Northwestern 66, Wisconsin 63: Craig Moore scored 26 points, including six free throws in the final 15.6 seconds, as the Wildcats (12-7, 4-5) sent the visiting Badgers (12-9, 3-6) to their sixth consecutive loss.
The Badgers routed Northwestern 74-45 on Jan. 7 and haven't won since. It's their longest skid since the 1997-98 season.
The Wildcats have won four of their past five games.
Ohio State 93, Indiana 81: Evan Turner had 29 points and 10 rebounds as the Buckeyes (15-5, 5-4) beat the Hoosiers (5-10, 0-8) in Bloomington, Ind. It was a school-record-tying 11th consecutive loss for Indiana.
Indiana's Matt Roth scored 29 points, making nine three-pointers, in 11 attempts, to tie a school record. It was the most three-pointers ever by a Big Ten freshman.
Several times, Hoosiers coach Tom Crean asked the scorer's table to show him a replay as if he wanted to challenge a call. Another time he pounded the table.